7 results on '"Zhao, Qiutong"'
Search Results
2. Formation of SiO2 thin films through plasma- enhanced chemical vapor deposition using SiH4/Ar/N2O
- Author
-
Zhang, Jingjing, Guo, Jingquan, Zhao, Qiutong, Yu, Lihui, Ye, Shujun, Yin, Hongxing, and Wang, Yeliang
- Published
- 2024
- Full Text
- View/download PDF
3. Phosphoric Acid Wet Etching of Sandwiched Silicon Nitride Nanolayers.
- Author
-
Zhao, Qiutong, Guo, Jingquan, Ye, Shujun, Zhang, Jingjing, and Yu, Lihui
- Subjects
- *
SILICON nitride , *THREE-dimensional integrated circuits , *ETCHING , *SEMICONDUCTOR manufacturing , *PHOSPHORIC acid , *BOILING-points , *SOLVENT extraction - Abstract
Wet etching of Silicon nitride (Si3N4) by phosphoric acid (H3PO4) is one of the key steps in the semiconductor fabrication process, especially for three‐dimensional integrated circuits (ICs). Unfortunately, few systematic studies of phosphoric acid etching of Silicon nitride are available. Summarizing how various factors affect etching and determining the reaction mechanism behind the etching process will help further optimize the etching process. In this work, how the boiling point of hydrous phosphoric acid solutions depends on phosphoric acid concentration is firstly investigated. Next, the etching of over 100 samples of Silicon nitride by H3PO4 at different concentrations and temperatures is systematically studied. The results show that the etching rate increases nearly linearly in both temperature and H3PO4 concentration, while temperature play more important role as compared to concentration. For each concentration, the reaction rate is maximal at the boiling point of the hydrous H3PO4 solution. Moreover, the etching rate of 85 wt % phosphoric acid is analyzed using the Arrhenius equation, yielding an apparent activation energy Ea=57.28 KJ/mol. Finally, a mechanism of Silicon nitride etching in phosphoric acid is proposed which explains the prior studies well. This work contributes to precisely control semiconductor processing for three‐dimensional ICs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Formation of Si nanopillars through partial sacrificing in super passivation reactive ion etching
- Author
-
Zhang, Jingjing, primary, Yu, Lihui, additional, Ye, Shujun, additional, Zhao, Qiutong, additional, Guo, Jingquan, additional, Yin, Hongxing, additional, and Wang, Yeliang, additional
- Published
- 2024
- Full Text
- View/download PDF
5. CMOS-Compatible Wafer-Level Double-layer Silicon Nanograss through Reactive Ion Etching for Applications in Optics.
- Author
-
Yu, Lihui, Zhang, Jingjing, Ye, Shujun, Zhao, Qiutong, Guo, Jingquan, and Wang, Yeliang
- Abstract
The modulation of the surface of silicon stimulates its applications in optics (antireflection surface, solar cells, and photoelectric devices). In this work, an appropriate ratio of the O
2 to SF6 plasma through reactive ion etching generated a double-layer Silicon nanograss (upper layerflocculent SiOx Fy passivation; lower layerpointy silicon spike) on the surface of the silicon wafer. The height and density of Silicon nanograss can be controlled through process parameters (pressure, O2 /SF6 ratio, and RF power), mask spacing, and a variety of assistant substrates. The underlying formation mechanisms of Silicon nanograss disclosed that the sputtering of Al substrate acts as a micromask, i.e., primarily responsible for the formation of Silicon nanograss. Considering an in-depth study, a simple, low-cost, and CMOS-compatible method for wafer-level preparation of Silicon nanograss is provided. Specifically, the Silicon nanograss exhibited excellent antireflection and enhanced absorption properties. This work contributes to micro-nano surface science accompanied by optical applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
6. IFRS adoption in China and its implication: the case of Chinese listed companies
- Author
-
Zhao Qiutong and Veiga, Maria do Rosário
- Subjects
Accounting industry ,China ,Difference between IFRS and new CAS ,Contabilidade ,M Business administration and business economics - Marketing - Accounting - Personnel economics ,Trabalho de projeto ,Ciências Sociais::Economia e Gestão [Domínio/Área Científica] ,IFRS International financial reporting standards ,Critério de convergência ,IFRS adopted in China ,Gestão de empresas ,Convergence ,M140 ,M480 ,Norma contabilística - Abstract
This thesis investigates how the International Financial Reporting Standard (IFRS) is adopted in China and its implications. The main studied questions are: How had the accounting industry changed in China due to IFRS? What are the reasons for China’s convergence of IFRS? What are the new accounting standards for China? What is the difference between the new Chinese Accounting Standards (CAS) and IFRS? Most representative listed companies in China were selected for analyzing their relationship with CAS in different factors. Such as political environmental factors, motivation of the reform, challenges during the implementation, ect. In light of the development of the global accounting unification. To minimize the impact of difference between the environmental and culture, the Chinese government had to choose to adopt part of IFRS and implement the new CAS to take part in the economic globalization. Thus, minor differences between the new CAS and IFRS still exist. From 2007 onwards, all listed companies in China are required to implement the new CAS. Facing with the new accounting standards and practice, the lack of professional accountants with international vision became a major stumbling block of China's accounting reformation. Este estudo explora a aplicação das IFRs na China e suas implicações. As principais questões de pesquisa são: Como é que mudou o contexto contabilístico na China? Qual é o motivo da convergência da China com as IFRS? Quais são os novos padrões contabilísticos na China? Qual a diferença entre as novas normas contabilísticas da China (CAS) e as IFRS? Para analisar os diferentes fatores na adopção das CAS foram analisadas as empresas listadas chinesas. Dos fatores ambientais, a reforma inclui o processo de implementação, os problemas e os desafios. Este estudo analisa as CAS e compara-as com as IFRS de acordo com o desenvolvimento global da contabilidade. Devido às grandes diferenças na cultura, o governo chinês optou por convergir com as IFRS na definição das novas CAS de modo a permitir uma abertura da economia chinesa à globalização económica. No entanto, a diferença entre CAS e IFRS ainda existe. Desde 2007, todas as empresas listadas chinesas solicitaram a implementação das novas CAS. Em face de novos padrões de contabilidade e novas tecnologias, a falta de auditores profissionais com uma perspectiva internacional tornou-se um obstáculo para a reforma contabilística na China.
- Published
- 2019
7. Elevated serum uric acid to creatinine ratio is associated with adverse pregnancy outcomes: a prospective birth cohort study.
- Author
-
Zhang E, Su S, Gao S, Zhang Y, Wang J, Liu J, Xie S, Yu J, Zhao Q, Yue W, Liu R, and Yin C
- Subjects
- Humans, Pregnancy, Female, Prospective Studies, Adult, Infant, Newborn, Diabetes, Gestational blood, Diabetes, Gestational epidemiology, Premature Birth blood, Premature Birth epidemiology, Hypertension, Pregnancy-Induced blood, Hypertension, Pregnancy-Induced epidemiology, Pregnancy Trimester, First blood, Cesarean Section statistics & numerical data, Risk Factors, Pregnancy Complications blood, Pregnancy Complications epidemiology, Maternal Age, China epidemiology, Creatinine blood, Uric Acid blood, Pregnancy Outcome epidemiology
- Abstract
Purpose: This study evaluated the association between maternal serum uric acid-to-creatinine ratio (SUA/SCr) in the first trimester and adverse maternal and neonatal outcomes. Methods: A prospective birth cohort study was conducted between 2018 and 2021. Logistic regression models and restricted cubic splines were utilized to estimate the associations between the SUA/SCr ratio and feto-maternal pregnancy outcomes. Women were stratified according to maternal age and pre-pregnancy body mass index. Results: This study included 33,030 pregnant women with live singleton pregnancies. The overall prevalence of gestational diabetes mellitus (GDM), pregnancy-induced hypertension (PIH), cesarean delivery, preterm birth, large-for-gestational age (LGA), small-for-gestational age, and low Apgar scores were 15.18%, 7.96%, 37.62%, 4.93%, 9.39%, 4.79% and 0.28%, respectively. The highest quartile of SUA/SCr was associated with the highest risk of GDM (odds ratio [OR] 2.14, 95% CI 1.93-2.36), PIH (OR 1.79, 95% CI 1.58-2.04), cesarean delivery (OR 1.24, 95% CI 1.16-1.33), and preterm birth (OR 1.30, 95% CI 1.12-1.51). The associations between SUA/SCr with adverse pregnancy outcomes showed linear relationships except for GDM (P < 0.001 for all, P < 0.001 for non-linearity). Subgroup analyses revealed that the associations between the SUA/SCr ratio and the risks of PIH and LGA were significantly stronger in younger pregnant women (P = 0.033 and 0.035, respectively). Conclusion: Maternal SUA/SCr levels were associated positively with the risk of adverse pregnancy outcomes. Timely monitoring of SUA and SCr levels during early pregnancy may help reduce the risk of adverse pregnancy outcomes and provide a basis for interventions., Competing Interests: Competing Interests: The authors have declared that no competing interest exists., (© The author(s).)
- Published
- 2024
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.